官网导出图片例子
运用到实际项目中报错或导出为空白
报错信息
Uncaught DOMException: Failed to execute ‘toDataURL’ on ‘HTMLCanvasElement’: Tainted canvases may not be exported.Uncaught
阅读背景：
openlayer导出图片报错Uncaught DOMException: Failed to execute ‘toDataURL‘ on ‘HTML_正兒八经DI瞎练ぃ的博客
来源：互联网
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